The Rules:
1) Untwinked.
2) No support from other players in any way.
3) Public gaming is acceptable, but you may not party, and may not take advantage of other players presence - no running through already clear areas, no using an already open entrance to the Durance, etc.
4) 1 additional character can be brought with and used as a mule. This character must be level 1 and is created at the same time as the Challenge Character.

That's about it. Definitely starting to notice my lack of killing power in hell. I was using Teleport to place my troops to get the first corpse on the ground faster, but I started to run out of money, so I had to stop.